Advanced Bash-Scripting Guide An in-depth exploration of the art of shell scripting

Table of Contents Chapter 1. Shell Programming! Chapter 2. Starting Off With a Sha-Bang 2.1. Invoking the script 2.2. Preliminary Exercises Part 2. Basics Chapter 3. Special Characters Chapter 4. Introduction to Variables and Parameters 4.1. Variable Substitution 4.2. Variable Assignment 4.3. Bash Variables Are Untyped 4.4. Special Variable Types Chapter 5. Quoting 5.1. Quoting Variables 5.2. Escaping Chapter 6. Exit and Exit Status Chapter 7. Tests 7.1. Test Constructs 7.2. File test operators 7.3. Other Comparison Operators 7.4. Nested if/then Condition Tests 7.5. Testing Your Knowledge of Tests Chapter 8. Operations and Related Topics 8.1. Operators 8.2. Numerical Constants 8.3. The Double-Parentheses Construct 8.4. Operator Precedence Part 3. Beyond the Basics Chapter 9. Another Look at Variables 9.1. Internal Variables 9.2. Typing variables: declare or typeset 9.2.1. Another use for declare 9.3. $RANDOM: generate random integer Chapter 10. Manipulating Variables 10.1. Manipulating Strings 10.1.1. Manipulating strings using awk 10.1.2. Further Reference 10.2. Parameter Substitution Chapter 11. Loops and Branches 11.1. Loops 11.2. Nested Loops 11.3. Loop Control 11.4. Testing and Branching Chapter 12. Command Substitution Chapter 13. Arithmetic Expansion Chapter 14. Recess Time Part 4. Commands Chapter 15. Internal Commands and Builtins 15.1. Job Control Commands Chapter 16. External Filters, Programs and Commands 16.1. Basic Commands 16.2. Complex Commands 16.3. Time / Date Commands 16.4. Text Processing Commands 16.5. File and Archiving Commands 16.6. Communications Commands 16.7. Terminal Control Commands 16.8. Math Commands 16.9. Miscellaneous Commands Chapter 17. System and Administrative Commands 17.1. Analyzing a System Script Part 5. Advanced Topics Chapter 18. Regular Expressions 18.1. A Brief Introduction to Regular Expressions 18.2. Globbing Chapter 19. Here Documents 19.1. Here Strings Chapter 20. I/O Redirection 20.1. Using exec 20.2. Redirecting Code Blocks 20.3. Applications Chapter 21. Subshells Chapter 22. Restricted Shells Chapter 23. Process Substitution Chapter 24. Functions 24.1. Complex Functions and Function Complexities 24.2. Local Variables 24.2.1. Local variables and recursion. 24.3. Recursion Without Local Variables Chapter 25. Aliases Chapter 26. List Constructs Chapter 27. Arrays Chapter 28. Indirect References Chapter 29. /dev and /proc 29.1. /dev 29.2. /proc Chapter 30. Network Programming Chapter 31. Of Zeros and Nulls Chapter 32. Debugging Chapter 33. Options Chapter 34. Gotchas Chapter 35. Scripting With Style 35.1. Unofficial Shell Scripting Stylesheet Chapter 36. Miscellany 36.1. Interactive and non-interactive shells and scripts 36.2. Shell Wrappers 36.3. Tests and Comparisons: Alternatives 36.4. Recursion: a script calling itself 36.5. "Colorizing" Scripts 36.6. Optimizations 36.7. Assorted Tips 36.7.1. Ideas for more powerful scripts 36.7.2. Widgets 36.8. Security Issues 36.8.1. Infected Shell Scripts 36.8.2. Hiding Shell Script Source 36.8.3. Writing Secure Shell Scripts 36.9. Portability Issues 36.9.1. A Test Suite 36.10. Shell Scripting Under Windows Chapter 37. Bash, versions 2, 3, and 4 37.1. Bash, version 2 37.2. Bash, version 3 37.2.1. Bash, version 3.1 37.2.2. Bash, version 3.2 37.3. Bash, version 4 37.3.1. Bash, version 4.1 37.3.2. Bash, version 4.2 Chapter 38. Endnotes 38.1. Author's Note 38.2. About the Author 38.3. Where to Go For Help 38.4. Tools Used to Produce This Book 38.4.1. Hardware 38.4.2. Software and Printware 38.5. Credits 38.6. Disclaimer Bibliography Appendix A. Contributed Scripts Appendix B. Reference Cards Appendix C. A Sed and Awk Micro-Primer C.1. Sed C.2. Awk Appendix D. Parsing and Managing Pathnames Appendix E. Exit Codes With Special Meanings Appendix F. A Detailed Introduction to I/O and I/O Redirection Appendix G. Command-Line Options G.1. Standard Command-Line Options G.2. Bash Command-Line Options Appendix H. Important Files Appendix I. Important System Directories Appendix J. An Introduction to Programmable Completion Appendix K. Localization Appendix L. History Commands Appendix M. Sample .bashrc and .bash_profile Files Appendix N. Converting DOS Batch Files to Shell Scripts Appendix O. Exercises O.1. Analyzing Scripts O.2. Writing Scripts Appendix P. Revision History Appendix Q. Download and Mirror Sites Appendix R. To Do List Appendix S. Copyright Appendix T. ASCII Table Index Notes